Haas Lathe CNC Program GCode question

RJ Martin Design said:

My son is working on a simple HAAS lathe program and it's not working out well for him.
He's trying to cut a step gage, with 1", 2" and 3" diameters, each step is 1" long

He has this:

G28
T101
G50S2500
S800 M03
G0 X0.1 Z0.1
G71 P11 Q18 U0.05 W0.05 D0.05 F0.02
N11 G00 X0.0 Z0.1
N12 G01 Z0.0 F0.02
X1.0
Z-1.0
X2.0
Z-2.0
X3.0
Z-3.0
Z0.1
N18 G00 Z0.2
N19
N0 G70 P11 Q19
M05
G28

It appears to make the part "backwards" when he runs it in the controller.
Any help greatly appreciated.........

Thanks,

RJ Martin

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jkruger said:

With this line he needs to "stage" the tool outside of the material dimensions:
Instead of
G0 X0.1 Z0.1;

Try G0 X3.1 Z.01;

This places the tool on the outside of the part and the G71 cycle then machines the profile from that position.

The X0.1 tells the cycle to start near the center of the part and work outward, like it were boring a hole.

Click to expand...